I'm getting the message below when I try to total my 'ExtendedOverCurrentMax' field.

The Value expression for the textrun ‘Textbox2.Paragraphs[0].TextRuns[0]’ has a scope parameter that is not valid for an aggregate function. The scope parameter must be set to a string constant that is equal to either the name of a containing group, the name of a containing data region, or the name of a dataset.

Thanks for the response. Below is the ERROR, when I tryed your expression.

The Value expression for the text box ‘Textbox2’ refers to the field ‘ExtendedOverCurrentMax’. Report item expressions can only refer to fields within the current dataset scope or, if inside an aggregate, the specified dataset scope. Letters in the names of fields must use the correct case.

Thanks for the coninued support. Below is the ERROR message. when using =Sum(Fields!ExtendedOverCurrentMax.Value,"Tablix4")

The Value expression for the text box ‘Textbox2’ refers to the field ‘ExtendedOverCurrentMax’. Report item expressions can only refer to fields within the current dataset scope or, if inside an aggregate, the specified dataset scope. Letters in the names of fields must use the correct case.